Performance And Parameter Optimization Research On Hybrid Suspension With Linear Motor

Vehicle produces vibrations influenced by road impact in the running process, the traditional passive suspension attenuates this part of the vibration through damping shock absorber, thus ensuring the ride comfort of the vehicle, but this part of the suspension vibration energy dissipates in the air in the form of heat energy. A great number of theories and experiments have shown that the regenerative vibration energy of vehicle suspension has great potential, but it attracts little attention and utilization. At present, the vast majority of experts and scholars at home and abroad mainly designed and developed active suspension to improve ride comfort, handling stability and driving safety of vehicles. Active suspension which generally is used for some large displacement luxury vehicles consume more energy to realize the active control, the design of the pursuit "energy-saving emission reduction" concept in today’s society is violated. Therefore, the novel suspension which not only can achieve active control but also regenarate the vibration energy became the new trend of the front suspension Design. This paper proposed a new idea of design of the suspension and added cylindrical permanent magnet linear motor to form the hybrid suspension. The cylindrical permanent magnet linear motor, damping shock absorber and a damping spring is connected in parallel form. The linear motor not only provides power to improve the performance of dynamic suspension as an electromagnetic actuator, but also recycles the energy of suspension vibration as a generator.Firstly, this paper determined the hybrid suspension structure through the comparison and analysis of the structures and properties of various types of suspension, and had carried on the elaboration to its working principle and working mode. Structure and principle of the linear motor and the principle of recycling the energy of suspension vibration were introduced. This paper built a road input model and a hybrid suspension ideal linear two degree of freedom model.Secondly, this paper made a simulation comparison for suspension performance of the hybrid suspension between active mode and passive regenerative mode. In active mode, this paper designed the LQG optimal controller, compared the hybrid suspension with active suspension and passive suspension in dynamic performance. It showed that the hybrid suspension and active suspension are consistent in performance, they are superior to the passive suspension. In the passive regenerative mode, energy regenerative circuit was designed, and this paper calculated the suspension power, motor power and power that supply charging power by simulation, showed that regenerative vibration energy of vehicle suspension has great potential, and this paper calculated the efficiency of regenerative energy, compared and analysed the dynamic performance of hybrid suspension and passive suspension, indicating that both parameters are basically the same. This paper made a sensitivity analysis on damping coefficient of hybrid suspension Cs and spring stiffness Ks.Then this paper adapted the particle swarm algorithm for the hybrid suspension to make optimization of the parameters, introduced the basic principle of particle swarm optimization algorithm, algorithm flow and the principle of selection of algorithm parameters. This paper made comfort, safety, and regenerative of energy property of suspension as the optimization objective. This paper made the damping coefficient CS and the spring stiffness KS as optimization variables. Particle swarm optimization program was written in Matlab or Simulink, optimization calculation is carried out.This paper made a comparison and analysis with the performance of the optimized hybrid suspension by simulation, indicated that the performance of the regenerative of energy property of suspension was increased, while the optimized hybrid suspension ensuring the dynamic performance.Finally, a corresponding bench test is built based on the simulation research, mainly including the regenerative capacity of the hybrid suspension test and dynamic performance test. The result of the text and the result of simulation are basically consistent, to verify the reliability of the optimization results. This paper have some reference value for the Selection of key parameters in the development of energy-saving type suspension.